Fujitsu AOY90 User Manual

ERROR
CONTENTS
ERROR CAUSE
REMEDY
ERROR
CODE
Low pressure
error
1. Open ball valve fully.
1. Ball valve not open
completely.
1. Generation condition.
When any of following
conditions satisfied:
1) Low-pressure protection
stops compressor 2 or more
times within 40 minutes.
2) Low pressure SW operates
after restarting 3 minutes
after compressor stopped by
low-pressure protector.
2. Corresponding operation.
Error display to outdoor unit
LED and error output to
communication bus line.
3. Reset condition.
When all of following
conditions satisfied:
1) Low pressure SW reset after
restarting 3 minutes after
compressor stopped by
low-pressure protection.
2) Low pressure protection not
operated for 40 minutes or
longer.
* Low pressure SW set value
0.2MPa OFF , 0.3MPa ON
25
2. Check pressure using pressure gauge.
If pressure SW faulty, replace SW.
3. Repair gas leak, and charge suitable
refrigerant.
4. Remove obstruction.
5. Clean filter.
2. Pressure SW faulty.
3. Gas leak.
4. Indoor unit short cycle.
5. Indoor unit filter clogged.
6. Check indoor fan motor operation. If
fan motor faulty, replace motor.
7. Check operation and coil resistance of
following electronic expansion valve. If
faulty, replace electronic expansion
valve.
Coil resistance measurement points.
Red-white, red-orange, brown-yellow,
brown-blue.
(1) Outdoor unit electronic expansion
valve EEV1 and EEV2.
Coil resistance: 192 +/-19 ohms.
(2) Indoor units electronic expansion valve
EEV.Coil resistance: 150 +/-15 ohms.
8. Check operation of following solenoid
valves. If operation faulty, replace
solenoid valve.
Cooling operation.
(1) Outdoor unit solenoid SV2.
(2) RB unit solenoid valve SVS.
Heating operation.
(3) Outdoor unit solenoid valves SV2,
SV7, and SV8
(4) RB unit solenoid valve SVD.
Heat recovery operation (1), (2), (3), (4).
6. Indoor unit fan motor faulty.
7. Electronic expansion valve
operation faulty.
8. Solenoid valve operation
faulty.
27 Oil recovery
error
1. Generation condition.
Oil judged to be below oil
sensor L level. Oil recovery
operation performed
consecutively 3 times or
more.
2. Corresponding operation.
Error display to outdoor unit
LED.
3. Reset condition.
Oil rises above oil sensor L
level.
1. Check operation of following solenoid
valves. If operation faulty, replace
solenoid valve.
Compressor 1 solenoid valve SV3.
Compressor 2 solenoid valve SV4.
Compressor 3 solenoid valve SV5.
Central oil return solenoid valve SV6.
1. Oil recovery solenoid valve
faulty.
2. Check for loose or dislodged solenoid
valves wiring connector.
2. Connector connection faulty.
– 107 –

Fujitsu AOY90 Specifications

General

Brand	Fujitsu
Model	AOY90
Category	Air Conditioner
Language	English